Which work is considered to be Dante Alighieri's masterpiece?

In the 1977 Imponderabilia, an example of performance art, viewers participated by

a) passing through a "living door" formed by the two naked artists, one male and the other female. b) giving a glass of water or a plate of food to the artist, who was taking a bath. c) cutting off pieces of clothing worn by the artist. d) dancing and singing with the artist and the other viewers.

"Stacking and piling" is another term for what structural system?

A. Arch and vault B. Corbelling C. Load-bearing construction D. Post-and-lintel